Because mine does since dc. When I've been depressed before it seemed relentless until the AD's started to work. Now I'll have a bad few days or fortnight and suddenly for no reason I'm fine again. I don't know whether I was just so busy at work before I didn't notice. It's been over 2 years now. I take Ad's and I'm fed up of it. I feel maybe it's hormonal but the pattern isn't well enough defined.
Anyone else?